Question about Troy Bilt Tb70ss Gas Trimmer

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Starts then stops , acts like it ran out of gas

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Make sure that your fuel mix is correct and clean. Also make sure there are no air bubbles trapped in the fuel line. Agitate the fuel tank to make sure there is no blockage caused by dirt and debris, and if you have a fuel filter fitted, then make sure it is clean and does not need replacing.

Next check the air filter to make sure it is clean.

Next check that the spark plug is whitish grey and matt in colour and not back, oily or pure white. If so then change the plug and set the correct spark gap for the particular type of plug you are using. If the plug is black and sooty or pure white matt then the fuel mix is incorrect and you will need to adjust this. Black indicates too much oil in the 2 stroke and burning low and the white indicates over temperature and probably not enough oil in the fuel mix or using to high an octane rating. If it is oily then there is far too much oil in the fuel mix and if you are using a 4 stroke or a 2 stroke with additional lubrication then there is oil leaking into the combustion area most likely caused by a worn or cracked piston ring. After that check that the carb is operating correctly and opens fully when starting and closes as the engine warms upon idle. Also make sure that it idles evenly. Also if it stops when you throttle it then look at the spark cap to make sure it is not loose or damaged and produces enough voltage to fire up the plug correctly otherwise you may have a generator issue or a carb problem or air filter problem or something restring air flow. Also check the engine casing over for any cracks or damage.

Posted on Oct 02, 2009

  • John Volborth
    John Volborth Feb 26, 2012

    Same problem. Bulb feels "squishy" when pumping and won't keep gas line filled. What are "specs" on the fuel lines? Air leaking around lines, etc?



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